The Square D 9001SKP1A9 Pilot Light is a switch accessory that provides a visual indication of the on/off status of a switch. This product is designed for use in electrical equipment and supplies, specifically in a business and industrial setting. The pilot light functions as a switch indicator, making it easy to identify the state of the switch from a distance or in low-light conditions. With its reliable operation and durable construction, the Square D 9001SKP1A9 Pilot Light is a useful addition to any electrical control system.